Roof unit and basic structure of a road-bound vehicle

ABSTRACT

The invention relates to a method for mounting a self-supporting vehicle roof ( 1 ) onto a body of a motor vehicle ( 2 ). The mounting method according to the invention utilizes a special, self-supporting roof construction of so-called sandwich type, which enables a complete roof ( 1 ), comprising both inner roof and outer roof, to be mounted as one of the last components in an assembly line for motor vehicles. After having been mounted, vehicle roofs ( 1 ) of the type which is utilized in the method according to the invention will constitute an integrated, load-bearing part of a vehicle body of a motor vehicle.

[0001] The present invention relates to a process for manufacturing avehicle body with a roof unit containing an outer skin and an inwardfacing ceiling, or an outer skin and an inward facing ceiling with aceiling frame, whereby the roof unit is in the form of a unit ready forinstallation and, a basic structure, and the ceiling and the outer skinalong with the basic structure feature configurations for joining thatmate with each other at their mutual places for joining, this for a bodyof a road-bound vehicle fitted together horizontally, and particularroof units.

[0002] It is known that manufacturing concepts for powered vehicles makeuse of individual modules that can be assembled separately. Thisconcerns in particular the whole of the dashboard including the cockpit.Further, described in the book Horst Pippert, Karosserie-technik,Vogel-Fachbuch, Vogel Publishers, Wurzburg, 1989, pp 242 and 244, isthat horizontal separation of the roof and base units can be useful.Before final assembly, individual fittings may be readily added to thebase unit. A process for manufacturing a horizontally separated vehiclebody is described in EP-B 0 250 678.

[0003] Known from DE 79 29 367 U is a roof structure for poweredvehicles having an outer skin and a roof frame that form a unit whichcan be attached to the columns of the vehicle body. The outer skin ofthe roof is joined along its edges to a profiled section frame, which isattached to the columns of the vehicle body.

[0004] Separate manufacture of roof and floor units or basic structurewas hardly adopted for series production purposes as the fittingtogether and joining of the roof to the base unit is difficult, or atleast complicated, and the overall stability of a vehicle body—and withthat its structural strength—is made worse compared with a body withside walls reaching up to the roof

[0005] Methods of manufacturing the rough bodywork from floor units andouter sheets suffer the disadvantage that the subsequent fitting out ofthe vehicle, e.g. installing all components in the region of the roofand the window posts, involves mounting or fitting these from the insideof the body frame. The freedom of movement for a person or a machine ina finished vehicle body is very limited. Consequently, manual work istiresome, and in some cases it is not possible to make use of robots.

[0006] The object of the present invention is to propose a process formanufacturing a vehicle body with a roof unit and a base unit or basicstructure for a horizontally joined body of a road-bound vehicle, suchthat the roof unit makes manufacturing simple, and the joining of theroof unit and the basic structure is easy, in particular inconveyor-belt series production.

[0007] That objective is achieved by way of a process described inclaims 1, 2, 4 and 5 and by particular roof units according to theclaims 6 and 7.

[0008] Preferably, at least the outer side of the roof unit bears acoating of paint, wholly or partially, on the parts that are visiblefrom the outside or are exposed to weathering. The paint may be a singleor multi-layer coating e.g. of undercoat, filler, top coat and/or atransparent organic coating etc. The paint can therefore already beapplied to the roof unit prior to joining the basic structure and roofunit.

[0009] The roof unit may contain e.g. the outer skin or the outer skinwith longitudinal and/or cross member(s) and the ceiling, if desiredalso a frame for the ceiling. The roof unit may also be essentially asingle shaped part making up the outer skin and the ceiling. Further,the roof unit may feature means for joining the longitudinal frame, thetransverse frame and/or the side wall columns such as A, B, C and ifpresent, D columns, window frames, especially those for fixed stationarywindows or frameless windows in the doors. The roof unit may alsocontain components such as roofs that slide open, can be raised, foldedand lamella type roofs, or rigid or moveable glass roofs and their frameparts, also elements for moving the same, roof-rack rails, antennae, andinterior fittings such as covering materials, hand grips in the roofarea, sun blinds, interior lighting, cables, operating and displayelements, modules for series-type airbags at the sides, window airbags,head/shoulder airbags etc.

[0010] The base unit or basic structure may e.g. be in any prefabricatedform. Preferred is a base unit—with respect to the interiorfittings—such featuring wiring, floor covering, seats, operatingelements, instruments etc.—to a large degree prefabricated, in order tominimise further work-steps in the vehicle interior formed by joiningthe roof and base units or basic structure.

[0011] The outer roof skin and also the ceiling frame may be made up ofone or more parts and of various materials. Suitable materials aremetals, plastics or combinations thereof. Preferred metals are ferrousand non-ferrous materials, in particular light weight metals. Includedin the group of light weight metals are aluminium and its alloys andmagnesium and its alloys. The outer skin of metal may be in the form ofsheet or—in particular in the case of aluminium or magnesium—in the formof a foamed shaped body or extruded section Ceiling frames may be e.g.of metal in particular aluminium or magnesium or their alloys and asstamped, pressed or extruded parts. Examples of plastic-based materialsfor outer roof skins, ceiling and ceiling frames are polyamides,including polyamides of diamines and aromatic dicarbonic acid(Aramides), polyesters, epoxy resins, polyurethanes, polyvinylchlorides,polycarbonates, acrylnitrile-styrene copolymers,acrylnitrile-butadiene-styrene copolymers (ABS), polyolefins etc. Theplastics may be fibre-reinforced plastics—such as plastics reinforcedwith glass or carbon fibres. The plastics may contain filler materials.The plastics may be in foamed of non-foamed state, including closed celland open cell foams and may be present both as hard or soft foams. Theouter roof skin, the ceiling and the ceiling frames may also be made upof a combination of metals and plastics such as composites, also knownas laminates or sandwich materials. The composites may have variousplastic layers or feature at least one sheet or section of metal and atleast one plastic layer. The ceiling frame may be a shaped part ofplastic such as in injection moulded part, a foamed shaped part or maybe of metal in particular light weight metals such as aluminium ormagnesium in the form of a stamped, pressure diecast part or as anextruded section, or a combination of plastic and metal. The ceilingframe may be painted or covered with material.

[0012] The outer roof skin may be in the form of a laminate with a metalor plastic layer forming the outer side and, facing inwards, at leastone foamed or non-foamed plastic layer. The outer roof skin and theceiling and possibly the ceiling frame, as one and the same shaped partor as separate shaped parts, may also be shaped parts with integral foamwith a closed, solid edge region that—moving away from the edge,gradually has the form of a fine-pored structure. Also, fibre mattingwith fibres of glass, cotton, flax or coconut etc. may be providedbetween the roof outer skin and the ceiling, or as ceiling itself orwithin a ceiling-laminate, from case to case as desired. By appropriatechoice of layer thickness and materials laminates may in particular bedesigned for optimal dampening of resonance and noise.

[0013] The ceiling may be a covering e.g. of leather, artificialleather, textiles, plastic films etc. These materials may be drawn overe.g. A shape-determining support of plastic, metal, foamed mats, foamedbodies, stiffened fibre matting etc. The ceiling may e.g. also be ashaped part of plastic, foamed plastic or integral foam such as e.g.mentioned above for the roof outer skin. The ceiling may have a sandwichstructure comprising a middle layer of foam e.g. polyurethane foam,fibre mats or fibre-glass fleece etc., on one or both sides and, mayfeature on one or both sides, plastic films, cover and/or decorative orfunctional covers. The ceiling may also include a ceiling frame.

[0014] The basic structure is closed off at the top by the ceiling framecomprising e.g. longitudinal members at the side or longitudinal membersat the side with front and rear cross members arranged between them, orwith the side wall columns and front and rear cross members.

[0015] Usefully, the roof unit contains the outer skin withconfiguration for connecting to the ceiling frame, such as alongitudinal member and/or a front and rear cross member and/or the sidewall columns such as A and C columns and if present B and D columns.

[0016] The outer skin of the roof may e.g. also be a single piece shapedpart with configuration for connecting to the ceiling frame, crossmembers and/or the side wall columns such as A and C columns and ifpresent B and D columns.

[0017] The roof unit preferably contains an outer skin and a ceilingframe with longitudinal members arranged at the sides of the outer skinand/or front and rear cross members. Another preferred version is suchthat the roof unit contains the outer skin and the ceiling frame, theceiling frame being one single shaped part.

[0018] Usefully, the outer skin and/or the ceiling frame containsfittings. The fittings include e.g. one or more of the following parts:ceiling cover, other interior cladding, cushioning against impact, sunshields, interior back-mirror, interior lighting, wiring, operating anddisplay elements, sliding, raising, folding, lamellar and glass roofsand their frame parts and corresponding drive elements, roof hand gripsetc. The outer skin may also feature outward facing attachment means forantennae, roof fittings such as luggage rack or rails.

[0019] Especially preferred are roof frames or side wall columns orcross members that feature connecting elements to which thecorresponding configurations for connecting on the ceiling frame or theouter skin may be attached. Suitable configurations for connectingpurposes on the ceiling frame or side wall columns or cross members arebolting, riveting, form-fit, clip or push-fit type connections etc. Forexample the configuration connecting facility of the roof unit could bethe means of attachment for the roof hand grips and/or the sun shields.Belonging to the wiring in the roof unit are in particular push-fitconnections which are preferably situated at the mutual joining pointson the roof and base units; the continuation of these is in thecorresponding wiring with corresponding push-fit connections in thebasic structure.

[0020] The scope of the present invention includes the production of thehorizontally assembled vehicle body comprising roof and basic structure.

[0021] The production process is e.g. performed in such a manner thatthe basic structure with respect to interior fittings such as seats,dashboard, operating elements etc. is to a large extent pre-fabricated.The basic structure terminates at the top e.g. with the longitudinalmembers at the sides and, with respect to the roof, a front and rearcross member. The ceiling, which in some case contains a ceiling frame,is in introduced through the opening for the rear or front window and,by means of an upward movement, is brought into contact with thematching con-figuration points for connection on the longitudinal framemembers at the side and/or the front and rear cross members where it isfixed into place. The ceiling may already have fittings attached to it.The ceiling may be connected to the longitudinal members and/or to thecross members via configurations for joining such as bolting or push-fitconnections which are foreseen e.g. for attaching the hand grips and/orthe sun shields. Subsequently, further fittings may be added asrequired. In a further step the outer skin is brought into contact withthe corresponding configuration for joining on the longitudinal membersat the side and the front and rear cross members by lowering it, andthen permanently attached there. The outer skin may be attached byadhesive bonding, welding, bolting, riveting, clamping, engaging by fitand shape, clinching or a combination of the different means ofattachment. Welding methods are in particular friction welding, MIG, TIGor laser welding.

[0022] The production process is performed in another manner which ise.g. such that the basic structure is to a large extent pre-fabricatedwith respect to interior fittings such as seats, dashboard, operatingelements etc. The basic structure terminates at the top e.g. with thelongitudinal members at the sides and, with respect to the roof, and afront and rear cross member. The ceiling frame is in introduced throughthe opening for the rear or front window and, by means of an upwardmovement, is brought into contact with the corresponding configurationpoints for connection on the longitudinal frame members at the sideand/or the front and rear cross members where it is fixed into place.The ceiling frame may already have fittings attached to it. The ceilingframe may be connected to the longitudinal members and/or to the crossmembers via configurations for joining such as bolting or push-fitconnections which are foreseen e.g. for attaching the hand grips and/orthe sun shields.

[0023] Subsequently, further fittings may be added as required. In afurther step the ceiling is lowered onto the ceiling frame and in somecases joined permanently to it. Finally the outer skin is lowered ontothe corresponding configuration for joining on the longitudinal membersat the side and the front and rear cross members and permanently joinedthere. The outer skin may be attached by adhesive bonding, welding,bolting, riveting, clamping, engaging by fit and shape, clinching or acombination of the different means of attachment. In this process it isalso possible to prefabricate the ceiling and outer skin by joining themtogether to make a unit out of them, to lower this unit onto the ceilingframe and the corresponding configuration for joining on thelongitudinal members at the sides and the front and rear cross members,and thereafter to join them permanently together.

[0024] The production process is performed in yet another manner whichis e.g. such that the basic structure is to a large extent prefabricatedwith respect to interior fittings such as seats, dash-board, operatingelements etc. The basic structure terminates at the top e.g. with thelongitudinal members at the sides. The roof unit—comprising outer skin,ceiling or ceiling and ceiling frame and a front and rear cross member,in each case with fittings already mounted—is in introduced between thetwo longitudinal members and, by means of an upward movement, is broughtinto contact with the corresponding configuration points for connectionon the longitudinal frame members where it is fixed into place. Theceiling or ceiling frame may be connected to the longitudinal membersvia configurations for joining such as screw-type or push-fitconnections which are foreseen e.g. for attaching ceiling hand grips.The ceiling is joined to the longitudinal members by means of furtherconfigurations for that purpose e.g. by interlocking by virtue of shapeand fit. The further configuration for joining may e.g. be in the formof a rib or ribs, or bulge or bulges, running along the side of theouter skin and corresponding groove or grooves, or rib or ribs, runningalong the longitudinal members. Adhesive and/or sealing masses arepreferably provided in the region of the joint made by the rib andgroove, or the bulge and groove. Possible means of joining thelongitudinal members and the outer skin in the region of their mutualconfiguration for joining are adhesive bonding, welding, clamping,clinching, riveting, bolting, either alone or a combination of thedifferent means of attachment.

[0025] The production process is performed in yet another manner whichis such e.g. that the basic structure is to a large extentpre-fabricated with respect to interior fittings such as seats,dash-board, operating elements etc. The basic structure terminates atthe top e.g. with the side wall columns. The side wall columns feature aconfiguration for attachment purposes.

[0026] The roof unit may be already feature fittings installed in it.The roof unit features the ceiling or ceiling and ceiling frame. Aconfiguration for joining to the side wall columns is provided on theceiling or on the ceiling frame. For example by lowering, raising orinserting the roof unit from the front or rear, the points of mutualconfiguration are brought into contact with each other and joinedpermanently together. Suitable configurations for joining are tongue andgroove, shoulder section and contact strips, cogged sections, plugs suchas conical plugs and holes, wedges engaging in slits, channel sectionsthat engage on a projection etc.

[0027] Adhesive joints may be made using adhesives. Examples ofadhesives are—apart from the physical bonding adhesives—the particularlysuitable chemically bonding adhesives. Belonging to the chemicallybonding adhesives are reaction type adhesives such as the two componentadhesives with epoxy resins and acetic anhydrides, epoxy resins andpolyamines, polyisocyanates and polyols or the single componentadhesives cyanacrylates or methacrylates, the two component adhesivesout of unsaturated polyesters and styrene or methacrylates, the singlecomponent adhesives of phenoplasts and polyvinyl acetalene ornitrile-caoutchoucs, the two component adhesive s of pyromellite aceticanhydride and 4.4-diamineo-diphenylether forming polyinides or ofpoly-benzimide-azoles. Adhesives that form duroplastics or possiblyelastic compounds are to be preferred.

[0028] At the areas or edges of contact between the roof and the basicstructure, and between the ceiling and ceiling frame, provision may bemade for clamping and/or sealing profiled sections, edge sections,closing off sections etc., of elastic materials, sealing strips orsealing masses etc.

[0029] The roof units according to the invention find preferentialapplication for road bound vehicles such as private cars and the like orfor the driver's cabin in lorries. Included in the category of privatecars are e.g. 2-door and 4-door limousines, two-seater cars, estatecars, vans and small buses.

[0030] With the roof units described above it is possible to fabricatethe basic structure almost to completion, whereby the roof initiallyremains open, and the opening in the roof remains available as workspaceand for introducing fittings. This provides an efficient productionmethod for fitting out the basic structure, followed by simple additionof the roof unit to the basic structure.

[0031] Various exemplified embodiments of the object of the inventionare explained in greater detail in the following with the aid ofdrawings viz.:

[0032] FIGS. 1 to 4 showing the first version of the assembly of a roofunit on a basic structure, the roof unit being mounted on the basicstructure in several steps.

[0033] FIGS. 5 to 7 showing a second version of the assembly of a roofunit on a basic structure where the ceiling and outer skin already forma unit with the basic structure prior to installation.

[0034] FIGS. 8 to 13 showing a third version of the assembly of a roofunit on a basic structure where the roof unit already contains theceiling, the ceiling frame, the outer skin and both cross members andrepresents a complete unit. Apart from its installation on the basicstructure, the roof unit requires no further work to it.

[0035]FIGS. 14 and 15 showing a fourth version of the assembly of a roofunit on a basic structure where the roof unit contains the complete roofframe

[0036] Shown in FIG. 1 is a basic structure 10 of a vehicle body whichalready has the side wall columns 24, 25, 26, 27, the front and rearcross frames 11 and 12 and the longitudinal frame members 16. The basicstructure 10 may feature further component parts; as these are notpertinent to the object of the invention they not shown here.

[0037]FIG. 2 shows a cross-section through a longitudinal frame member16 which represents the upper limit of the basic structure 10. Thelongitudinal frame features an extrusion seal 19, and a connectingelement 20 features e.g. an internal thread, a sleeve etc. When the carbody is being assembled, the roof unit is fitted onto the largelyprefabricated basic structure 10.

[0038]FIG. 3 shows further parts that can be built onto the basicstructure 10 e.g. the ceiling 14, such as a foamed body covered with alining 31, ceiling frame 15 and airbag module 18 e.g. for side wallairbags, window airbags or head/shoulder airbags. During production ofthe vehicle, the ceiling 14 along with the ceiling frame 15 is insertedthrough the front or rear window opening and, in an upwards movement,the ceiling frame 15 brought up to the points for connecting it to thelongitudinal frame members 16. The ceiling frame 15 is joined to thelongitudinal frame members 16—one of various possible attachmentpoints—via the attachment of the roof hand-grip 17, which in turn issecured to the connecting element 20. The lower edge region of theceiling frame 15 is accommodated by the seal 19. Provided the fittingshave not already been mounted on the ceiling 14 or the ceiling frame 15and therefore already in place, further fittings in the roof region maybe mounted from above.

[0039] Shown in FIG. 4, also in cross-section, is the outer skin 13 ofthe roof which is mounted in a further production step onto thelongitudinal frame 16, which is part of the basic structure 10. Theouter skin 13 can be lowered from above onto the longitudinal frame. Theouter skin 13 and the cross members II and 12 shown in FIG. 1 arepermanently joined to the basic structure 10 at the seam 21 e.g. byadhesive bonding and/or welding.

[0040]FIG. 5 shows a ceiling frame 15 which may be of one or a pluralityof parts, preferably one part. The ceiling frame 15 may e.g. be a shapedpart of metal such as a pressure diecasting, or a foamed body such as anintegral foam body etc.

[0041]FIG. 6 shows a cross-section through a longitudinal frame 16 ofbasic structure 10; the ceiling frame 15 along with airbag module 18 aremounted by way of the connecting element 20 to which the hand grip 17 isattached. The lower edge of the ceiling frame is accommodated by theprofiled seal 19. The ceiling frame 15 may be introduced into the basicstructure e.g. through the front or rear window opening and raised tothe connecting points on the longitudinal frame 16 and the crossmembers. The ceiling frame 15 may e.g. also be introduced by tilting andlowering into the basic structure before being raised again to thematching connecting points on the longitudinal frame 16 and the crossmembers.

[0042]FIG. 7 shows a further assembly step beyond that shown in FIG. 6in which a unit—comprising the outer skin 13 already attached to theceiling 14 is mounted on the ceiling frame 15 and the roof frame(containing both longitudinal frame members 16, the front cross members11 and rear cross member 12)—joined permanently to the roof frame atseam 21 by adhesive bonding and/or welding.

[0043] Shown in FIG. 8 are the relevant parts of a basic structure 10 ofa vehicle body including side wall columns 24, 25, 26, 27 and thelongitudinal frame 16. This differs from that shown in FIG. 1 in thatthe front and rear cross members 11 and 12 are missing.

[0044]FIG. 9 shows a fully installed roof unit 23 with ceiling 14,ceiling frame 15, outer skin 13, rear cross member 12 and front crossmember 11. The roof unit 23 may also include interior fittings not shownhere such as e.g. wiring, holding grips, sun shields, interior lighting,operating and display elements, sliding, raising, folding and lamellarroofs, or rigid or moveable glass roofs and their frame parts as well asdriving mechanisms for moveable roofs.

[0045]FIG. 10 shows the mounting of the roof unit 23 shown in FIG. 9 tothe basic structure 10. For that purpose the roof unit 23 is introducede.g. from the front between the two columns 24 into the interior of thevehicle in the direction of the arrow, then subsequently raised up untilthe roof unit 23 and the basic structure 10 touch at the matching pointsof joining.

[0046]FIG. 11 shows the cross-section of one of the two longitudinalframe members 16 before fitting on the roof unit 23 shown in FIG. 10.

[0047]FIGS. 12 and 13 show in cross-section the vertical fitting of roofunit 23 according to FIG. 10. The roof unit 23 is raised to the roofframe of the basic structure 10 until it touches it. The groove 29 andthe corresponding bulge 28 may be provided over the whole length of theroof unit 23 or longitudinal frame members 16 and cross members 11, 12.On raising the roof unit 23 further the bulge 28 fits into the groove29. This first connection may be fixed further by connection of the handgrips 17 to the connecting elements 20. At joints such as in the regionof the bulge 28 and groove 29 further means of joining may be employedand the longitudinal frame members 16 for example welded, adhesivelybonded, bolted, clipped etc to the roof skin 13. The other parts whichhave not been mentioned can be identified from the reference numbers inthe previous figures.

[0048]FIG. 14 shows a further possible version of a roof assembly unitwhereby this roof unit, in addition to the components in the roof unit23, contains both longitudinal frame members 16 which along with thecross members 11 and 12 form a closed roof frame. In the roof unit shownin FIG. 14 the side wall airbag module 18, the connecting elements 20etc., are already connected to the longitudinal members 16. Further, theroof unit in FIG. 14 features the connecting means 30 which permit theroof unit to be joined to the basic structure 10 shown in the nextfigure viz., FIG. 15.

[0049]FIG. 15 shows the basic structure 10 relating to FIG. 14, whichcontains the side columns of the car body, A column 24, B column 25, Ccolumn 26 and D column 27. At the upper ends of the side columns are thecorresponding connecting means 30 Further vehicle components on thebasic structure in FIG. 15 were omitted here.

1. Process for manufacturing a vehicle body with a roof unit (23)containing an outer skin (13) and an inward facing ceiling (14), or anouter skin (13) and an inward facing ceiling (14) with a ceiling frame(15), whereby the roof unit (23) is in the form of a unit ready forinstallation, and a basic structure (10), and the ceiling (14) and theouter skin (13) along with the basic structure (10) featureconfigurations (30) for joining that mate with each other at theirmutual places for joining, this for a body of a road-bound vehiclefitted together horizontally, characterised in that the ceiling (14) isintroduced through the opening for the rear or front window and, bymeans of an upward movement, is brought into contact with the matchingconfiguration points (30) for connection on the longitudinal frames (16)at the side and/or the front and rear cross members (11, 12) where it isfixed and, in a further step, the outer skin (13) is lowered onto thecorresponding matching configuration points (30) for connection to thelongitudinal frames (16) at the side and onto the front and rear crossmembers (11, 12), and secured there by permanent joining.
 2. Process formanufacturing a vehicle body with a roof unit (23) containing an outerskin (13) and an inward facing ceiling (14), or an outer skin (13) andan inward facing ceiling (14) with a ceiling frame (15), whereby theroof unit (23) is in the form of a unit ready for installation, and abasic structure (10), and the ceiling (14) and the outer skin (13) alongwith the basic structure (10) feature configurations (30) for joiningthat mate with each other at their mutual places for joining, this for abody of a road-bound vehicle fitted together horizontally, characterisedin that, the ceiling frame (15) is introduced through the opening forthe rear or front window and, by means of an upward movement, is broughtinto contact with the matching configuration points (30) for connectionon the longitudinal frames (16) at the side and/or the front and rearcross members (11, 12) where it is fixed and, in a further step, theceiling (14) and the ceiling frame (15) are lowered followed by the roofskin (13) onto the corresponding matching configuration points (30) forconnection to the longitudinal frames (16) and the side and onto thefront and rear cross members (11, 12), and secured there by permanentjoining.
 3. Process for manufacturing a vehicle body with a roof unit(23) according to claim 2, characterised in that the ceiling (14) andthe outer skin (13) are joined together as a unit and this unit islowered onto the ceiling frame (15) and the corresponding matchingconfiguration points (30) for connection on the longitudinal frames (16)at the side and the front and rear cross members (11, 12), and securedthere by permanent joining.
 4. Process for manufacturing a vehicle bodywith a roof unit (23) containing an outer skin (13) and an inward facingceiling (14), or an outer skin (13) and an inward facing ceiling (14)with a ceiling frame (15), whereby the roof unit (23) is in the form ofa unit ready for installation, and a basic structure (10) and theceiling (14) and the outer skin (13) along with the basic structure (10)feature configurations (30) for joining that mate with each other attheir mutual places for joining, this for a body of a road-bound vehiclefitted together horizontally, characterised in that the roof unit (23)containing the outer skin (13) with configuration (30) for joining, theceiling (14) or the ceiling (14) and the ceiling frame (15), in eachcase with fittings already mounted in place, is introduced through theopening between the longitudinal frames (16) and, by means of an upwardmovement, is brought into contact with the corresponding, matchingconfiguration points (30) and permanently joined there.
 5. Process formanufacturing a vehicle body with a roof unit (23) containing an outerskin (13) and an inward facing ceiling (14), or an outer skin (13) andan inward facing ceiling (14) with a ceiling frame (15), whereby theroof unit (23) is in the form of a unit ready for installation, and abasic structure (10) and the ceiling (14) and the outer skin (13) alongwith the basic structure (10) feature configurations (30) for joiningthat mate with each other at their mutual places for joining, this for abody of a road-bound vehicle fitted together horizontally, characterisedin that, the side wall columns (24, 25, 26, 27) of the basic structure(10) exhibit a configuration (30) for connecting purposes and the roofunit (23) has fittings installed and the roof unit (23) exhibits aceiling (14) or the ceiling (14) and a ceiling frame (15), and aconfiguration (30) for connecting to the side wall columns (24, 25, 26,27) is provided on the ceiling (14) or ceiling frame (15) and, bylowering, raising or inserting the roof unit (23) from the front orrear, the mutual configurations (30) for connecting purposes are broughttogether and joined permanently with each other.
 6. A roof unit (23)containing an outer skin (13) and an inward facing ceiling (14), or anouter skin (13) and an inward facing ceiling (14) with a ceiling frame(15), whereby the roof unit (23) is in the form of a unit ready forinstallation, and a basic structure (10), whereby the ceiling (14) andthe outer skin (13) along with the basic structure (10) featureconfigurations (30) for joining that mate with each other at theirmutual places for joining, this for a body of a road-bound vehiclefitted together horizontally, characterised in that, the ceiling (14)contains one or more fittings of the following type viz., ceiling cover,interior cladding, cushioning against impact, sun shields, interiorback-mirror, interior lighting, wiring, operating and display elements,sliding, raising, folding, lamellar and glass roofs, and their frameparts and drive elements, and roof hand grips.
 7. A roof unit (23)containing an outer skin (13) and an inward facing ceiling (14), or anouter skin (13) and an inward facing ceiling (14) with a ceiling frame(15), whereby the roof unit (23) is in the form of a unit ready forinstallation, and a basic structure (10), whereby the ceiling (14) andthe outer skin (13) along with the basic structure (10) featureconfigurations (30) for joining that mate with each other at theirmutual places for joining, this for a body of a road-bound vehiclefitted together horizontally, characterised in that, the ceiling (14)has a sandwich structure comprising a middle layer of foam, with on oneor both sides fibre mats or fleeces of glass fibres and on one or bothsides plastic films, cover films and/or decorative or functionaloverlays.